Physics Final Review

Forces

100

This law states that objects in motion tend to stay in motion, and objects at rest stay at rest. It's also called the "Law of Inertia"!

What is Newton's First Law?

200

If you're on a ramp, your weight (F_g) stays the same, but this force changes with the angle of the ramp!

What is Normal Force?

300

This force is responsible for resisting motion due to two surfaces rubbing together. It's pretty low if you're on ice, though!

What is Friction?

400

This law, in words: the net total of all forces acting on an object is equal to the object's mass times its acceleration.

What is Newton's Second Law, ΣF = m*a?

500

This is the weight of a 10 kg object on Earth, where acceleration due to gravity is g = 9.81 m/s²

What is 98.1 N?

Energy

100

This type of energy involves springs, rubber bands, and other materials that stretch or compress, but can return to their original shape.

What is Elastic Potential Energy?

200

If you apply a force over a distance, you've done this!

What is Work?

300

This type of energy is used for objects in motion, and depends on the velocity v.

What is Kinetic Energy?

400

This law says that the final energy total is equal to the initial energy total plus any work done on the system, or: ΣE_F = ΣE_I + W

What is the Law of Conservation of Energy?

500

If you're an expensive vase on a shelf 1.5 meters above the ground, you have this kind of energy. Better hope it doesn't turn into kinetic!

What is Gravitational Potential Energy?

Momentum

100

This is the momentum of a 15 kg cart moving at 2.5 m/s.

What is 37.5 kg*m/s?

200

If two objects collide and the kinetic energy changes, we call it this type of collision.

What is an Inelastic Collision?

300

This is the change in momentum due to a force acting over time.

What is Impulse, Δp = F*Δt ?

400

This is the overall momentum of an object with p_x = 3.0 kg*m/s and p_y = 4.0 kg*m/s

What is p = 5.0 kg*m/s?

500

A 2.5 kg ball moving forwards at 3 m/s collides with a 1.2 kg ball at rest. The 2.5 kg ball is now rolling backwards at 2 m/s. What is the velocity of the 1.2 kg ball?

What is v_2,f = 10.42 m/s?

Equations

100

The other side of this equation is: ½*k*Δx²

What is E_E (elastic potential energy) ?

200

The other side of this equation is: m_1*v_1,f + m_2*v_2,f

What is m_1*v_1,i + m_2*v_2,i (total initial momentum)?

300

The other side of this equation is: m*g*h

What is E_G (gravitational potential energy)?

400

The other side of this equation is: v_i*t + ½*a*t².

What is Δx (distance)?

500

The other side of this equation is: F*d*cos(θ).

What is W (work) ?

Unit Roundup

100

This is the unit for force, named for Isaac, who also has some sweet laws about forces.

What is the Newton (kg*m/s²)?

200

This is the unit for power, found by dividing "work" by time (W/t). Lightbulb moment!

What is the Watt (J/s, or kg*m²/s³)?

300

This is the unit for energy. No, not like the gem. No, not like the e-cigarette either!

What is the Joule (N*m, or kg*m²/s²)?

400

This is the unit for momentum. No fancy name, just three other units in a trenchcoat.

What is the kilogram meter per second (kg*m/s)?

500

This is the unit for the spring constant. It describes how much force it takes to stretch a spring one meter.

What is "newtons per meter" (N/m)?